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fs/nsfs.c: Added ns_match
ns_match returns true if the namespace inode and dev_t matches the ones provided by the caller. Signed-off-by: Carlos Neira <cneirabustos@gmail.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20200304204157.58695-2-cneirabustos@gmail.com
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parent
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14
fs/nsfs.c
14
fs/nsfs.c
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@ -247,6 +247,20 @@ struct file *proc_ns_fget(int fd)
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return ERR_PTR(-EINVAL);
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}
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/**
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* ns_match() - Returns true if current namespace matches dev/ino provided.
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* @ns_common: current ns
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* @dev: dev_t from nsfs that will be matched against current nsfs
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* @ino: ino_t from nsfs that will be matched against current nsfs
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*
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* Return: true if dev and ino matches the current nsfs.
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*/
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bool ns_match(const struct ns_common *ns, dev_t dev, ino_t ino)
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{
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return (ns->inum == ino) && (nsfs_mnt->mnt_sb->s_dev == dev);
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}
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static int nsfs_show_path(struct seq_file *seq, struct dentry *dentry)
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{
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struct inode *inode = d_inode(dentry);
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@ -85,6 +85,8 @@ typedef struct ns_common *ns_get_path_helper_t(void *);
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extern int ns_get_path_cb(struct path *path, ns_get_path_helper_t ns_get_cb,
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void *private_data);
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extern bool ns_match(const struct ns_common *ns, dev_t dev, ino_t ino);
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extern int ns_get_name(char *buf, size_t size, struct task_struct *task,
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const struct proc_ns_operations *ns_ops);
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extern void nsfs_init(void);
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